The MPPT value for IC1 (ADP5090ACPZ-1-R7) is set by the resistors R2 and R3. The resistance values are as follows:

The MPPT voltage can be calculated using the formula from the IC's datasheet:

Let's calculate:

Please note that the actual MPPT voltage on the IC can only be known by measuring it in the circuit.

Can I disable MPPT?

Yes, you can disable the Maximum Power Point Tracking (MPPT) function on the ADP5090ACPZ-1-R7 IC. According to the datasheet, if the MPPT pin is connected to ground (GND), the MPPT function is disabled and the energy harvesting input voltage (VIN) operates close to the cold start voltage.

However, please note that disabling MPPT might reduce the overall efficiency of the solar energy harvesting system because the IC will no longer be optimizing the input voltage to extract the maximum power from the solar cell.

What MPPT value will you recommend for 2.76 V solar cell?

For a solar cell with a maximum power point (MPP) at 2.76V, it is generally recommended to set the MPPT voltage to about 70-80% of the MPP. This is because solar cells typically operate at their maximum efficiency at around 70-80% of their open-circuit voltage (Voc).

So, for a 2.76V solar cell, the recommended MPPT voltage would be:

This is the voltage at which the IC will try to keep the solar cell operating for maximum power extraction.

To set this voltage on the ADP5090, you would need to adjust the resistors R2 and R3 according to the formula:

You can solve this equation for the desired resistance values.

Remember to consider the power rating and tolerance of the resistors, as these factors can affect the precision of the MPPT voltage.